Police investigators examining the scene of an accident involving two cars measure 79-meter long skidmarks of one of the cars which nearly came to a stop before colliding. the coefficient of kinetic friction between rubber and the pavement is about 0.82. estimate the initial speed of that car assuming a level road.

Explanation:

As we know that friction force on the car during it applied brakes is given as

so the deceleration of the car is given as

now we can use kinematics to find the initial speed of the car

so we will have

now plug in all the data in it

a and b sometimes have a positive value

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.